<template>
  <a-tree v-bind="getAttrs" @change="handleChange">
    <template #[item]="data" v-for="item in Object.keys($slots)">
      <slot :name="item" v-bind="data || {}"></slot>
    </template>
    <template #suffixIcon v-if="loading">
      <LoadingOutlined spin/>
    </template>
  </a-tree>
</template>

<script lang="ts">
import {type Recordable, type AnyFunction} from '@xueyi/types';
import {type PropType, computed, defineComponent, watch, ref, onMounted, unref} from 'vue';
import {Tree} from 'ant-design-vue';
import {isArray, isFunction} from '/@/utils/is';
import {get} from 'lodash-es';
import {propTypes} from '/@/utils/propTypes';
import {LoadingOutlined} from '@ant-design/icons-vue';

export default defineComponent({
  name: 'ApiTree',
  components: {ATree: Tree, LoadingOutlined},
  props: {
    api: {type: Function as PropType<(arg?: Recordable<any>) => Promise<Recordable<any>>>},
    params: {type: Object},
    immediate: {type: Boolean, default: true},
    resultField: propTypes.string.def(''),
    afterFetch: {type: Function as PropType<AnyFunction>},
  },
  emits: ['options-change', 'change'],
  setup(props, {attrs, emit}) {
    const treeData = ref<Recordable<any>[]>([]);
    const isFirstLoaded = ref<Boolean>(false);
    const loading = ref(false);
    const getAttrs = computed(() => {
      return {
        ...(props.api ? {treeData: unref(treeData)} : {}),
        ...attrs,
      };
    });

    function handleChange(...args) {
      emit('change', ...args);
    }

    watch(
      () => props.params,
      () => {
        !unref(isFirstLoaded) && fetch();
      },
      {deep: true},
    );

    watch(
      () => props.immediate,
      (v) => {
        v && !isFirstLoaded.value && fetch();
      },
    );

    onMounted(() => {
      props.immediate && fetch();
    });

    async function fetch() {
      const {api, afterFetch} = props;
      if (!api || !isFunction(api)) return;
      loading.value = true;
      treeData.value = [];
      let result;
      try {
        result = await api(props.params);
      } catch (e) {
        console.error(e);
      }
      if (afterFetch && isFunction(afterFetch)) {
        result = afterFetch(result);
      }
      loading.value = false;
      if (!result) return;
      if (!isArray(result)) {
        result = get(result, props.resultField);
      }
      treeData.value = (result as Recordable<any>[]) || [];
      isFirstLoaded.value = true;
      emit('options-change', treeData.value);
    }

    return {getAttrs, loading, handleChange};
  },
});
</script>
